/// <summary>Reads a unary expression, sub-expression, or literal</summary>
/// <param name="pos">Position of first token of expression</param>
/// <returns>Expression tree</returns>
/// <exception cref="Logic::AlgorithmException">Attempted to read incorrect type of Token</exception>
/// <exception cref="Logic::ExpressionParserException">Syntax error</exception>
/// <remarks>Advances the iterator to beyond the end of the expression</remarks>
ExpressionParser::ExpressionTree ExpressionParser::ReadUnaryExpression(TokenIterator& pos)
{
// Rule: Unary = (! / - / ~)? Value
// Match: Operator
if (MatchOperator(pos, MAX_PRECEDENCE))
{
// Read: operator (may throw)
const ScriptToken& op = ReadOperator(pos);
// Manually convert binary-substract to unary-minus
ScriptToken unary = (op.Text != L"-" ? op : ScriptToken(TokenType::UnaryOp, op.Start, op.End, op.Text));
// Read: Value (may throw)
return ExpressionTree(new UnaryExpression(unary, ReadValue(pos)));
}
// Read: Value (may throw)
return ReadValue(pos);
}
void CScriptDlg::OnModify()
{
CScintillaWnd* pSelected = GetSelectedScintilla();
long pos = pSelected->GetCurrentPosition()-1;
if(pos < 0)
pos = 0;
CString text = pSelected->GetText();
// Okay our goal is to work out what the user is typing.
// for example:
// myobject.function
// so we need to get all the stuff on the left and right
int start = 0;
m_BeforeDotText = "";
m_AfterDotText = "";
m_OperatorText = "";
m_Dot = false;
/*
CString selected = pSelected->GetSelectedText();
if(selected != "")
{
selected.Replace(".","");
m_BeforeDotText = selected;
UpdateList();
return;
}
*/
// First case: we have typed something like mykeyword.whatever.
if(ScriptToken(text.GetAt(pos)))
{
for(int c = pos; c >= 0; c--) // loop backwards
{
if(!ScriptToken(text.GetAt(c)))
{
start = c+1;
c = -1;
}
}
int length = text.GetLength();
int end = length;
for(int c = pos+1; c < length; c++) // loop forwards
{
if(!ScriptToken(text.GetAt(c)) || text.GetAt(c) == '.')
{
end = c;
c = length;
}
}
CString token = text.Mid(start, end-start);
int dot = token.Find('.');
CString First = token;
CString Second = "";
if(dot != -1)
{
Second = First.Mid(dot+1, length - dot-1);
First = First.Left(dot);
m_Dot = true;
}
m_BeforeDotText = First;
m_AfterDotText = Second;
}
else if(KeywordToken(text.GetAt(pos)))// we have typed something else, such as a symbol like ==
{
for(int c = pos-1; c >= 0; c--) // loop backwards
{
if(!KeywordToken(text.GetAt(c)))
{
start = c+1;
c = -1;
}
}
int length = text.GetLength();
int end = length;
for(int c = pos; c < length; c++) // loop forwards
{
if(!KeywordToken(text.GetAt(c)))
{
end = c-1;
c = length;
}
}
m_OperatorText = text.Mid(start, end-start);
}
UpdateList();
}
